[bugfix] Browser keeps scanning directory with gpkg file

Fixes #17043 by introducing a check for last directory
scan timestamp and skipping the directoryChanged signal
is the last scan was less than 10 seconds in the past.

Tested with > 300 gpkg files in a single directory.

Author: elpaso

src/core/qgsdataitem.cpp

@@ -765,7 +765,7 @@ QVector<QgsDataItem *> QgsDirectoryItem::createChildren()
     }
 
   }
-
+  mLastScan = QDateTime::currentDateTime();
   return children;
 }
 
@@ -794,6 +794,11 @@ void QgsDirectoryItem::setState( State state )
 
 void QgsDirectoryItem::directoryChanged()
 {
+  // If the last scan was less than 10 seconds ago, skip this
+  if ( mLastScan.msecsTo( QDateTime::currentDateTime() ) < 10000 )
+  {
+    return;
+  }
   if ( state() == Populating )
   {
     // schedule to refresh later, because refresh() simply returns if Populating

src/core/qgsdataitem.h

@@ -28,6 +28,7 @@
 #include <QString>
 #include <QTreeWidget>
 #include <QVector>
+#include <QDateTime>
 
 #include "qgsmaplayer.h"
 #include "qgscoordinatereferencesystem.h"
@@ -487,6 +488,7 @@ class CORE_EXPORT QgsDirectoryItem : public QgsDataCollectionItem
   private:
     QFileSystemWatcher *mFileSystemWatcher = nullptr;
     bool mRefreshLater;
+    QDateTime mLastScan;
 };
 
 /** \ingroup core